Niobium crystallise in body-cetred cubic structure. If density is 8.55 g cm^-3, calculate atomic radius of niobium using its atomic mass 93 u.

2

(a)

Calculate the amount of benzoic acid (C₆H₅COOH) required  for preparing 250 ml of 0.15 M solution in methanol.

2

(a)

5 g of a compound was dissolved in 100 g of water at 303 K. The vapour pressure of the solution was found to be 4.16 kilopascal. If the vapour pressure of pure water is 4.24 kPa at this temperature, what is the molecular mass of the compound?

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V₁ cc of solution having molarity M₁ is diluted to have molarity M₂. Derive expression (in terms of M₁,M₂ and V₁) for the volume of water required to be added.

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Ezpress the relation among cell constant, resistance of the solution in the cell and conductivity of the solution. How is molar conductivity of solution related to its conductivity.

2

(a)

Find the oxidation states of halogens in the following:
(i) CI₂O     (ii) KBrO₃     (iii) NaCIO₄     (iv) CIO₂

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(a)

Show that in cubic packed structure, eight tatrahedral voids are persent per unit cell.

2

(a)

Why molecularity is applicable only for elementary reactions and order is applicable for elementary as well as complex reactions?

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Name three oxoacids of nitrogen.  Write the disproportionation reaction of that oxoacid of nitrogen in which nitrogen is in +3 oxidation state.

2

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Atomic radius of Cu is greater than that of Cr but ionic radius of Cr²⁺ is greater than that of Cu²⁺ . Give suitable explanation.

2

(a)

Which type of biomolecules have some structural similarity with synthetic polymides ? What is this similarity ?

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(a)